Plants host at the contact zone with soil a distinctive root-associated bacterial microbiota believed to function in plant nutrition and health. We investigated the diversity of the root microbiota within a phylogenetic framework of hosts: three Arabidopsis thaliana ecotypes along with its sister species Arabidopsis halleri and Arabidopsis lyrata, as well… (More)

We studied 16 patients with electrocardiographic evidence of advanced interatrial block and retrograde activation of the left atrium (P greater than or equal to 0.12 s, and diphasic (+/-) P waves in leads II, III, and VF). Eight patients had valvular heart disease, four had dilated cardiomyopathy and four had other forms of heart disease. Patients with… (More)

A 23-year-old man who underwent surgical correction of a true pulmonary artery aneurysm is presented. Pathological features and the different surgical alternatives for treatment of this lesion are discussed.

Many experimental and clinical studies have demonstrated that it is possible to trigger atrial fibrillation (AF) by vagal stimulation which reduces and disperses the atrial refractory periods and decreases the threshold of fibrillation. In order to induce fibrillation, it is necessary to deliver a stimulation near to the refractory period. It has also been… (More)

Ventricular fibrillation (VF) is a well-known but rare complication of the Wolff-Parkinson-White syndrome (WPW). Clinical and electrophysiological data of 23 patients with spontaneous VF were compared with data from 100 consecutive patients with WPW without VF but with symptomatic supraventricular tachycardia. The 23 patients were collected in a multicentre… (More)